docs: def to_json(self):
          """Convert the Design Day to a dictionary."""
          return {
              'name': self.name,
              'day_type': self.day_type,
              'location': self.location.to_json(),
              'dry_bulb_condition': self.dry_bulb_condition.to_json(),
              'humidity_condition': self.humidity_condition.to_json(),
              'wind_condition': self.wind_condition.to_json(),
              'sky_condition': self.sky_condition.to_json()
          }